Patent US3592687A successfully refreshed from Google Patents.
US3592687A
Expired / Lapsed
US
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Production of magnetic recording media
Assignee: BASF SE
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Filing: 1969-01-06
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Granted: 1971-07-13
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Expires: 1989-01-06
Abstract
Abstract A METHOD OF PRODUCING MAGNETIC RECORDING MEDIA BY APPLYING TO A BASE A COATING OF A DISPERSION OF A MAGNETIC PIGMENT, PRETREATED WITH WAX OR WAX-LIKE SUBSTANCES, IN A SPECIAL CURABLE COPLYMER OF ALKENYL BENZENE HYDROCARBONS (METH)ACRYLIC ESTERS, ETHERIFIED N-METHYLAMIDES OF (METH)ACRYLIC ACID AND AN ADDITIONAL COMONOMER, DRYING AND CURING THE APPLIED COATING; AND THE MAGNETIC RECORDING MATERIAL THUS OBTAINED.
Inventors
- 👤 Georg Schnell
- 👤 Job-Werner Hartmann
- 👤 Heinz Stritzinger
- 👤 Werner Senkpiel
- 👤 Hans Joerg Hartmann
- 👤 Erich Albert Sobotta
- 👤 Karl Uhl
- 👤 Gerhard Werst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:32
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |